Adjusting device in compasses.



No. 824,311. PATENTED JUNE 26, 1906, G. SGHOENNER. ADJUSTING DEVICE IN GOMPASSES.

APPLICATION FILED SEPT.26.1905.

GEORG SOHOENNER, OF NUREMBERG, GERMANY.

ADJUSTING DEVICE IN COMPASSES- Specification of Letters Patent.

Patented June 26, 1906.

Application filed September 26, 1905. Serial No. 280,221.

To all whom it may concern:

Be it known that I, GEoRG SGHOENNER, a citizen of the Empire of Germany, residing at Nuremberg, in the Empire of Germany, have V invented a new and useful Adjusting Device in Compasses, of which the following is a specification.

My invention relates to improvements in drawing-compasses, whereby needle-points pointed either at the one or at both ends may be longitudinally adjusted by means of a crank-disk on the leg and a connecting-rod, a pin being employed for connecting the needle, point with the connectingrod.

I will now proceed to describe my invention with reference to the accompanying drawings, in which Figure 1 is a side view, on an enlarged scale, of a leg of a pair of compasses with the adjusting device. Fig. 2 is a longitudinal section through the same on the line A B in Fig. 1. Fig. 3 is a side view similar to Fig. 1, in which the adjusting device is modified; and Fig. 4 is a longitudinal section through the line C D in Fig. 3.

Similar letters of reference refer to similar parts throughout the several views.

In Figs. 1 and 2 of the drawings I have shown a leg a of a pair of compasses, which leg in its free end is longitudinally bored and slitted to form two elastic Wings 6 e. In the bore of the leg a a needlepoint b is longitudinally movable and a screw d serves for pressing the two wings e e on the needlepoint I) in the usual manner. The needlepoint 6 is provided with two pins k k, either of which can be guided in the external slit 0. On the external side of the leg a is secured a screw m, on which a crank-diskf ismounted to turn. This dish f is provided witha crankpin g, on which an elastic connecting-rod h is mounted to rock. The other end of the connecting-rod h has a hole "L, in which either pin 7.;- of the needle-point b can engage.

The adjusting device is operated as follows: Assuming the needle-point b to have been so inserted in the bore of the leg a that its desired pointed end is without, then the elastic connecting-rod h is bent outwardly for in troducing the respective pin it into its hole i and the crank-diskf is turned to move longitudinally the needle-point b, by means of the connecting-rod h, until the pointed end of the needle-point b is adjusted, whereupon the latter is secured by screwing home the screw (1.

In Figs. 3 and 4 the adjusting device is in the same manner as before.

only modified in that the pin it is rigidly con nected with the connecting-rod it instead of with the needle-point b. In this case the needle-point b is provided with two necks Z Z, in either of which the pin can engage. This modified adjusting device is operated much The adjusting device may be varied without departing from the spirit of my invention.

What I claim as my invention, and desire to secure by Letters Patent, is

1. In compasses, the combination with a compass-leg the free end of which is longitudinally hollowed and slitted to form two elastic wings, of a needle-point longitudinally movable in the cavity of said compass-leg, a pin on said compass-leg, a crank-disk mounted to turn on said pin and provided with a crank-pin, a connecting-rod the one end of which is mounted to rock on said crank-pin, a pin connecting the other (11d of said connecting-rod with said needle-point, said pin being secured to one of said parts and a screw adapted to press the two wings of said compass-leg on said needle-point.

2; In compasses, the combination with a compass-leg the free end of which is longitudinally hollowed and slitted to form two elastic wings, of a needle-point longitudinally movable in the cavity of said compass-leg and having a pin which is guided in the slit, a screw on said compass leg, a crankdisk mounted to turn on said screw and provided with a crank-pin, a connecting-rod connected with said crank-disk by means of its crank-pin and with said said needle-point by means of the pin on said point, and a screw adapted to press the two wings of said compass-leg on said needle-point.

3. In compasses, the combination with a compass-leg the free end of which is longitudinally hollowed and slitted to form two elastic wings, of a needle-point longitudinally movable in the cavity of said compass-leg, a screw on said compass leg, a crank-disk mounted to turn on said screw and provided with a crank-pin, a connecting-rod the one end of which is connected with said crankdisk by means of its crank-pin, means for detachably connecting the other end of the rod to the needlepoint, and a screw adapted to press the two wings of said compass-leg on said needlepoint.

4. In compasses, the combination with a compass-leg the free end of which is longitudinally bored and slitted to form two elastic wings, of a needle-point longitudinally movable in the bore of said compass-leg, a pin on sald compass-leg, a crank-disk mounted to turn on said pin and provided with a crankpm, a connecting-rod the one end of which is mounted to rock on said crank-pin, a pin connecting the other end of said connecting-rod with said needle-point, said pin being secured to one of said parts and a screw adapted to press the two Wings of said compass-leg on said needle-point.

5. In compasses, the combination with a compass-leg the free end of which is longituninally bored and slitted to form two elastic wings, of a needle-point longitudinally movable in the bore of said compass-leg and having a pin which is guided in the slit, a screw on said compass-leg, a crank-disk mounted to turn on said screw and provided with a crank-pin, a connecting-rod connected with said crank-disk by means of its crank-pin and with said needle-point by means of the pin on said point, and a screw adapted to press the two wings of said compass-leg on said needlepoint.

' In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

G-EORG SOHOENNER. Witnesses:

LEONHARD KOERBER, OSCAR BOOK. 

